![]() The zygote, or fertilized egg, is a single cell formed by the fusion of an egg and sperm cell. The cells composing a tissue share a common embryonic origin. (Micrographs provided by the Regents of University of Michigan Medical School © 2012) Clockwise from nervous tissue, LM × 872, LM × 282, LM × 460, LM × 800. Figure 4.1.1 – The Four Primary Tissue Types: Examples of nervous tissue, epithelial tissue, muscle tissue, and connective tissue found throughout the human body. ![]() Muscle and nervous tissue will be discussed in detail in future chapters. This chapter will focus on examining epithelial and connective tissues. ![]() Nervous tissue is also excitable, allowing for the generation and propagation of electrochemical signals in the form of nerve impulses that communicate between different regions of the body ( Figure 4.1.1).Īn understanding of the various primary tissue types present in the human body is essential for understanding the structure and function of organs which are composed of two or more primary tissue types. Muscle tissue contracts forcefully when excited, providing movement. Connective tissue, as its name implies, binds the cells and organs of the body together. Thus, any disruption in the structure of a tissue can lead to injury or disease.Įpithelial tissue refers to groups of cells that cover the exterior surfaces of the body, line internal cavities and passageways, and form certain glands. The primary tissue types work together to contribute to the overall health and maintenance of the human body. These categories are epithelial, connective, muscle, and nervous. Tissues are organized into four broad categories based on structural and functional similarities. Histology is the the field of study that involves the microscopic examination of tissue appearance, organization, and function. The term tissue is used to describe a group of cells that are similar in structure and perform a specific function. Identify the various types of tissue membranes and the unique qualities of each.Describe the embryonic origin of tissue.Identify the four primary tissue types and discuss the structure and function of each.Identify the main tissue types and discuss their roles in the human body.īy the end of this section, you will be able to:
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